| openbill | (noun) stork with a grooved bill whose upper and lower parts touch only at the base and tip | - |
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| oscillation | (noun) (physics) a regular periodic variation in value about a mean | Synonyms: vibration |
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| (noun) a single complete execution of a periodically repeated phenomenon | Synonyms: cycle |
| (noun) the process of oscillating between states | - |
| oscillator | (noun) generator that produces sonic oscillations or alternating current | - |
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| oscillogram | (noun) the recording produced by an oscillograph | - |
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| oscillograph | (noun) a device for making a record of the wave forms of fluctuating voltages or currents | - |
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| oscilloscope | (noun) electronic equipment that provides visual images of varying electrical quantities | Synonyms: cathode-ray oscilloscope, CRO, scope |
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| overkill | (noun) any effort that seems to go farther than would be necessary to achieve its goal | - |
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| (noun) the capability to obliterate a target with more weapons (especially nuclear weapons) than are required | - |
| overspill | (noun) the occurrence of surplus liquid (as water) exceeding the limit or capacity | Synonyms: overflow, runoff |
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| (noun) the relocation of people from overcrowded cities; they are accommodated in new houses or apartments in smaller towns | - |
| oxacillin | (noun) a form of penicillin resistant to penicillinase and effective against penicillin-resistant staphylococci | - |
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| paillasse | (noun) mattress consisting of a thin pad filled with straw or sawdust | Synonyms: palliasse |
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| painkiller | (noun) a medicine used to relieve pain | Synonyms: analgesic, anodyne, pain pill |
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| papilla | (noun) a small projection of tissue at the base of a hair or tooth or feather | - |
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| (noun) a small nipple-shaped protuberance concerned with taste, touch, or smell | - |
| (noun) (botany) a tiny outgrowth on the surface of a petal or leaf | - |
| papilledema | (noun) swelling of the optic disc (where the optic nerve enters the eyeball); usually associated with an increase in intraocular pressure | - |
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| papilloma | (noun) a benign epithelial tumor forming a rounded mass | Synonyms: papillary tumor, papillary tumour, villoma |
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| papillon | (noun) small slender toy spaniel with erect ears and a black-spotted brown to white coat | - |
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| pastille | (noun) a medicated lozenge used to soothe the throat | Synonyms: cough drop, pastil, troche |
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| peccadillo | (noun) a petty misdeed | Synonyms: indiscretion |
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| penicillamine | (noun) a drug (trade name Cuprimine) used to treat heavy metal poisoning and Wilson's disease and severe arthritis | Synonyms: Cuprimine |
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| penicillin | (noun) any of various antibiotics obtained from Penicillium molds (or produced synthetically) and used in the treatment of various infections and diseases | - |
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| penicillinase | (noun) enzyme produced by certain bacteria that inactivates penicillin and results in resistance to that antibiotic | Synonyms: beta-lactamase |
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| phillipsite | (noun) a group of white or reddish crystalline minerals of the zeolite family consisting of a hydrous silicate of calcium and potassium and aluminum | - |
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| piccalilli | (noun) relish of chopped pickled cucumbers and green peppers and onion | - |
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| pigswill | (noun) wet feed (especially for pigs) consisting of mostly kitchen waste mixed with water or skimmed or sour milk | Synonyms: pigwash, slop, slops, swill |
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| pill | (noun) a dose of medicine in the form of a small pellet | Synonyms: lozenge, tab, tablet |
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| (noun) something that resembles a tablet of medicine in shape or size | - |
| (noun) a contraceptive in the form of a pill containing estrogen and progestin to inhibit ovulation and so prevent conception | Synonyms: anovulant, anovulatory drug, birth control pill, contraceptive pill, oral contraceptive, oral contraceptive pill |
| (noun) something unpleasant or offensive that must be tolerated or endured | - |
| (noun) a unpleasant or tiresome person | - |
| pillage | (noun) the act of stealing valuable things from a place | Synonyms: pillaging, plundering |
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| (noun) goods or money obtained illegally | Synonyms: booty, dirty money, loot, plunder, prize, swag |
| pillager | (noun) someone who takes spoils or plunder (as in war) | Synonyms: despoiler, freebooter, looter, plunderer, raider, spoiler |
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| pillaging | (noun) the act of stealing valuable things from a place | Synonyms: pillage, plundering |
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| pillar | (noun) (architecture) a tall vertical cylindrical structure standing upright and used to support a structure | Synonyms: column |
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| (noun) a vertical cylindrical structure standing alone and not supporting anything (such as a monument) | Synonyms: column |
| (noun) a fundamental principle or practice | - |
| (noun) a prominent supporter | Synonyms: mainstay |
| (noun) anything that approximates the shape of a column or tower | Synonyms: column, tower |
| pillbox | (noun) a small enclosed gun emplacement (usually of fortified concrete) | - |
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| (noun) a small case for holding pills | - |
| (noun) a small round woman's hat | Synonyms: toque, turban |
| pillion | (noun) a seat behind the rider of a horse or motorbike etc. | - |
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| pillock | (noun) a person who is not very bright | Synonyms: dolt, dullard, poor fish, pudden-head, pudding head, stupe, stupid, stupid person |
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| pillory | (noun) a wooden instrument of punishment on a post with holes for the wrists and neck; offenders were locked in and so exposed to public scorn | - |
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| pillow | (noun) a cushion to support the head of a sleeping person | - |
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| pillowcase | (noun) bed linen consisting of a cover for a pillow | Synonyms: case, pillow slip, slip |
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| pillwort | (noun) European water fern found around margins of bodies of water or in wet acid soil having small globose sporocarps | Synonyms: Pilularia globulifera |
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| piperacillin | (noun) a synthetic type of penicillin antibiotic (trade name Pipracil) used for moderate to severe infections | Synonyms: Pipracil |
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| pistillode | (noun) a sterile vestigial pistil remaining in a staminate flower | - |
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| playbill | (noun) a theatrical program | - |
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| pointillism | (noun) a genre of painting characterized by the application of paint in dots and small strokes; developed by Georges Seurat and his followers in late 19th century France | - |
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| (noun) a school of painters who used a technique of painting with tiny dots of pure colors that would blend in the viewer's eye; developed by Georges Seurat and his followers late in 19th century France | - |
| pointillist | (noun) a painter who uses the technique of pointillism | - |
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| poorwill | (noun) goatsucker of western North America | Synonyms: Phalaenoptilus nuttallii |
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| postillion | (noun) someone who rides the near horse of a pair in order to guide the horses pulling a carriage (especially a carriage without a coachman) | Synonyms: postilion |
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| pusillanimity | (noun) contemptible fearfulness | Synonyms: pusillanimousness |
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| pusillanimousness | (noun) contemptible fearfulness | Synonyms: pusillanimity |
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| quadrille | (noun) a square dance of 5 or more figures for 4 or more couples | - |
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| (noun) music for dancing the quadrille | - |
| quadrillion | (noun) the number that is represented as a one followed by 15 zeros | - |
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| (noun) the number that is represented as a one followed by 24 zeros in the UK | - |
| quadrillionth | (noun) one part in a quadrillion equal parts | Synonyms: one-quadrillionth |
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| quesadilla | (noun) a tortilla that is filled with cheese and heated | - |
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| quill | (noun) a stiff hollow protective spine on a porcupine or hedgehog | - |
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| (noun) the hollow spine of a feather | Synonyms: calamus, shaft |
| (noun) any of the larger wing or tail feathers of a bird | Synonyms: flight feather, pinion, quill feather |
| (noun) pen made from a bird's feather | Synonyms: quill pen |
| quillwort | (noun) any of several spore-bearing aquatic or marsh plants having short rhizomes and leaves resembling quills; worldwide except Polynesia | - |
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| quintillion | (noun) the number that is represented as a one followed by 18 zeros in the US | - |
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| quintillionth | (noun) one part in a quintillion equal parts | Synonyms: one-quintillionth |
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| raillery | (noun) light teasing repartee | Synonyms: backchat, banter, give-and-take |
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| ratatouille | (noun) a vegetable stew; usually made with tomatoes, eggplant, zucchini, peppers, onion, and seasonings | - |
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| razorbill | (noun) black-and-white northern Atlantic auk having a compressed sharp-edged bill | Synonyms: Alca torda, razor-billed auk |
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| refill | (noun) a commercial product that refills a container with its appropriate contents | - |
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| (noun) a prescription drug that is provided again | - |
| refilling | (noun) filling again by supplying what has been used up | Synonyms: renewal, replacement, replenishment |
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| reveille | (noun) a signal to get up in the morning; in the military it is a bugle call at sunrise | - |
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| (noun) (military) signal to wake up | Synonyms: wake-up signal |
| rill | (noun) a small stream | Synonyms: rivulet, run, runnel, streamlet |
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| (noun) a small channel (as one formed by soil erosion) | - |
| roadkill | (noun) the dead body of an animal that has been killed on a road by a vehicle | - |
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| rockabilly | (noun) a fusion of black music and country music that was popular in the 1950s; sometimes described as blues with a country beat | - |
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| rosilla | (noun) a sneezeweed of southwestern United States especially southern California | Synonyms: Helenium puberulum |
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| saddlebill | (noun) large black-and-white stork of tropical Africa; its red bill has a black band around the middle | Synonyms: Ephippiorhynchus senegalensis, jabiru |
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| salsilla | (noun) tropical vine having pink-and-yellow flowers spotted purple and edible roots sometimes boiled as a potato substitute; West Indies to northern South America | Synonyms: Bomarea edulis |
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| (noun) tropical vine having umbels of small purple flowers and edible roots sometimes boiled as a potato substitute; Colombia | Synonyms: Bomarea salsilla |
| sapodilla | (noun) tropical fruit with a rough brownish skin and very sweet brownish pulp | Synonyms: sapodilla plum, sapota |
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| (noun) large tropical American evergreen yielding chicle gum and edible fruit; sometimes placed in genus Achras | Synonyms: Achras zapota, Manilkara zapota, sapodilla tree |
| sarsaparilla | (noun) carbonated drink flavored with an extract from sarsaparilla root or with birch oil and sassafras | - |
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| (noun) any of various prickly climbing plants of the tropical American genus Smilax having aromatic roots and heart-shaped leaves | - |
| sawbill | (noun) large crested fish-eating diving duck having a slender hooked bill with serrated edges | Synonyms: fish duck, merganser, sheldrake |
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| sawmill | (noun) a mill for dressing logs and lumber | Synonyms: lumbermill |
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| (noun) a large sawing machine | - |
| schilling | (noun) formerly the basic unit of money in Austria | Synonyms: Austrian schilling |
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| scilla | (noun) an Old World plant of the genus Scilla having narrow basal leaves and pink or blue or white racemose flowers | Synonyms: squill |
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| scillaren | (noun) a crystalline steroidal glycoside present in squill (Drimia maritima). | - |
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| scintilla | (noun) a sparkling glittering particle | - |
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| (noun) a tiny or scarcely detectable amount | Synonyms: iota, shred, smidge, smidgen, smidgeon, smidgin, tittle, whit |
| scintillation | (noun) the quality of shining with a bright reflected light | Synonyms: glisten, glister, glitter, sparkle |
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| (noun) the twinkling of the stars caused when changes in the density of the earth's atmosphere produce uneven refraction of starlight | - |
| (noun) a brilliant display of wit | - |
| (noun) a rapid change in brightness; a brief spark or flash | Synonyms: sparkling, twinkle |
| (noun) (physics) a flash of light that is produced in a phosphor when it absorbs a photon or ionizing particle | - |
| septillion | (noun) the number that is represented as a one followed by 24 zeros in the US | - |
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| sextillion | (noun) the number that is represented as a one followed by 21 zeros | - |
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| shill | (noun) a decoy who acts as an enthusiastic customer in order to stimulate the participation of others | - |
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| shillalah | (noun) a cudgel made of hardwood (usually oak or blackthorn) | Synonyms: shillelagh |
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| shillelagh | (noun) a cudgel made of hardwood (usually oak or blackthorn) | Synonyms: shillalah |
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| shilling | (noun) an English coin worth one twentieth of a pound | - |
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| (noun) a former monetary unit in Great Britain | Synonyms: bob, British shilling |
| (noun) the basic unit of money in Kenya; equal to 100 cents | Synonyms: Kenyan shilling |
| (noun) the basic unit of money in Somalia; equal to 100 cents | Synonyms: Somalian shilling |
| (noun) the basic unit of money in Tanzania; equal to 100 cents | Synonyms: Tanzanian shilling |
| (noun) the basic unit of money in Uganda; equal to 100 cents | Synonyms: Ugandan shilling |
| shillyshally | (noun) the act of procrastinating; putting off or delaying or deferring an action to a later time | Synonyms: cunctation, procrastination |
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| shoebill | (noun) large stork-like bird of the valley of the White Nile with a broad bill suggesting a wooden shoe | Synonyms: Balaeniceps rex, shoebird |
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| shrilling | (noun) a continuing shrill noise | - |
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| shrillness | (noun) having the timbre of a loud high-pitched sound | Synonyms: stridence, stridency |
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| (noun) the quality of being sharp or harsh to the senses | - |
| sill | (noun) structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure | - |
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| (noun) (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock | - |
| sillabub | (noun) sweetened cream beaten with wine or liquor | Synonyms: syllabub |
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| (noun) spiced hot milk with rum or wine | Synonyms: syllabub |
| silliness | (noun) a ludicrous folly | Synonyms: absurdity, fatuity, fatuousness |
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| (noun) an impulsive scatterbrained manner | Synonyms: giddiness |
| silly | (noun) a word used for misbehaving children | - |
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| skill | (noun) ability to produce solutions in some problem domain | Synonyms: science |
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| (noun) an ability that has been acquired by training | Synonyms: accomplishment, acquirement, acquisition, attainment |
| skillessness | (noun) Lack of skill; ineptness. | - |
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| skillet | (noun) a pan used for frying foods | Synonyms: frying pan, frypan |
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| skilletfish | (noun) clingfish with typical skillet shape | Synonyms: Gobiesox strumosus, skillet fish |
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| skillfulness | (noun) the state of being cognitively skillful | - |
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| skilly | (noun) a thin porridge or soup (usually oatmeal and water flavored with meat) | - |
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| spicemill | (noun) a mill for grinding spices | - |
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| spill | (noun) the act of allowing a fluid to escape | Synonyms: release, spillage |
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| (noun) a sudden drop from an upright position | Synonyms: fall, tumble |
| (noun) a channel that carries excess water over or around a dam or other obstruction | Synonyms: spillway, wasteweir |
| (noun) liquid that is spilled | - |
| spillage | (noun) the act of allowing a fluid to escape | Synonyms: release, spill |
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| (noun) the amount that has spilled | - |
| spiller | (noun) a long fishing line with many shorter lines and hooks attached to it (usually suspended between buoys) | Synonyms: setline, trawl, trawl line, trotline |
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| (noun) an attacker who sheds or spills blood | Synonyms: shedder |
| spillikin | (noun) a thin strip of wood used in playing the game of jackstraws | Synonyms: jackstraw |
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| spillikins | (noun) a game in which players try to pick each jackstraw (or spillikin) off of a pile without moving any of the others | Synonyms: jackstraws |
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| spillover | (noun) (economics) any indirect effect of public expenditure | - |
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